Limitations for Lambda Powered by Amazon IoT Greengrass - Amazon Snowball Edge Developer Guide
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Limitations for Lambda Powered by Amazon IoT Greengrass

If you allocate the minimum recommendation of 128 MB of memory for each of your functions, you can have up to seven Lambda functions in a single job. This limitation occurs because the physical nature of the Snowball Edge limits the amount of memory available for running Lambda functions on the device.